The mass of an object indicate the amount of matter it contains, and the weight is a force that results from the action of gravity on the mass of the object.
When we are referring to the amount of matter that a body or an object contain we should use the magnitude of the mass and not the weight that is because the weight is a force.
It is the physical magnitude that expresses the force exerted by gravity on the mass of a body, this is expressed in units of the international system in Newton.
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